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Variable damping force damper

a damper and variable technology, applied in the direction of shock absorbers, mechanical equipment, transportation and packaging, etc., can solve the problems of reducing the mechanical strength of the piston main body, affecting the smoothness of the telescopic, so as to reduce the number of assembly steps, prevent the deformation of the electric coil, and reduce the number of components

Active Publication Date: 2014-07-03
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a damper structure for a vehicle suspension system. The technical effects of the invention include preventing deformation of the piston easily, reducing wear of the seal, and preventing wire break or valve break. The invention also provides a structure that allows for variable damping force control with a single electromagnetic coil, reduces the number of components and assembly steps, and suppresses bending, rotation, and twisting of the piston.

Problems solved by technology

In the variable damping force dampers disclosed in Patent Documents 1 and 2, since the electromagnetic coil is disposed between the inner yoke and the outer yoke, the mechanical strength of the piston main body is reduced, and this may cause the following problems.
This may cause deformation of the electromagnetic coil, such that the axis of the outer yoke is offset from the axis of the inner yoke, resulting in a slight misalignment between the axis of the cylinder and the axis of the piston main body.
This may hinder a smooth telescopic action of the damper and cause a seal, which is provided in a cylinder end portion such that the piston rod is in slidable contact therewith, to be worn out in a relatively short period of time.

Method used

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Examples

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first modified embodiment

[0027]As shown in FIG. 6, in the piston 16 according to the first modified embodiment, the hollow cylindrical outer yoke 31 and the columnar inner yoke 34 are separately formed of a ferromagnetic material, and these yokes 31 and 34 are connected with each other by a hollow cylindrical connection member 61 made of a non-magnetic material (such as austenitic stainless steel or aluminum alloy). The connection member 61 is inserted between the outer yoke 31 and the inner yoke 34 and is secured to these yokes 31 and 34 by means of press-fitting, welding, adhesion or the like. In the first modified embodiment, a connection member made of a ferromagnetic material as shown in the exemplary embodiment is not included, and thus, the magnetic flux generated by the electromagnetic coil 43 acts upon the valve plates 41, 42 without leaking out in the middle, as shown by broken lines in FIG. 6. Further, the connection member 61 has a much larger axial size than the connection member in the exempla...

second modified embodiment

[0028]As shown in FIG. 7, in the piston 16 according to the second modified embodiment, the outer yoke 31 and the inner yoke 34 are connected with each other by the connection member 35 as in the exemplary embodiment, but the connection member 61 made of a non-magnetic material is securely fitted in a part of the first gap 32 on the side of the contraction-side valve plate 42. The mode of operation in the second modified embodiment is substantially the same as that in the foregoing exemplary embodiment, but owing to the combination of the connection member 35 and the connection member 61, relative displacement between the outer yoke 31 and the inner yoke 34 can be restrained more effectively.

third modified embodiment

[0029]As shown in FIG. 8, in the piston 16 according to the third modified embodiment, the outer yoke 31 and the inner yoke 34 are connected with each other by the connection member 35 as in the exemplary embodiment, but connection members 61, 62 each made of a non-magnetic material are securely fitted in a part of the first gap 32 close to the compression-side valve plate 42 and a part of the second gap 33 close to the expansion-side valve plate 41, respectively. The mode of operation in the third modified embodiment is substantially the same as that in the second modified embodiment, but relative displacement between the outer yoke 31 and the inner yoke 34 can be restrained even more effectively.

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Abstract

Provided is a solenoid-type variable damping force damper that improves the strength of the piston and prevents wire break in the electromagnetic coil. A piston includes a piston main body, an expansion-side valve plate, a contraction-side valve plate, an electromagnetic coil, and a bolt. The piston main body is an integrally formed component made of a ferromagnetic material, and includes a hollow cylindrical outer yoke that is in slidable contact with an inner peripheral surface of a cylinder, a columnar inner yoke having an outer peripheral surface opposing an inner peripheral surface of the outer yoke via first and second gaps, and a connection member connecting the outer yoke and the inner yoke with each other at an axially middle position of the piston and separating the first and second gaps from each other. The electromagnetic coil is fitted in the second gap of the piston main body.

Description

TECHNICAL FIELD[0001]The present invention relates to a solenoid-type variable damping force damper for use in a suspension of an automobile, and particularly relates to technology for improving the strength of a piston and preventing wire break in an electromagnetic coil.BACKGROUND OF THE INVENTION[0002]A suspension is an important element that significantly affects the driving stability of an automobile, and typically includes, as main components thereof, a link (such as an arm, rod, etc.) that supports a wheel to be movable vertically relative to a vehicle body, a spring that is flexible to absorb impact from a road surface or the like, and a damper for damping the oscillation of the spring. Such a damper for an automotive suspension is typically embodied as a tubular damper which includes a hollow cylinder filled with hydraulic oil, a piston configured to slide in the cylinder in an axial direction, and a piston rod having an end connected with the piston, where the hydraulic oi...

Claims

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Application Information

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IPC IPC(8): F16F9/348F16F9/22
CPCF16F9/22F16F9/3484B60G17/08F16F9/535
Inventor NAKAJIMA, KIYOSHI
Owner HONDA MOTOR CO LTD
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